I went bombling with mine only because it's one pet I've loved forever and actually made me go engy way back in BC when you could only get one or the other of it and Lil' Smokey. (I then went back to skinning/LW for raiding because Drums were OP. After they put Lil' Smokey in as a drop I leveled engy yet again.)

The dragonling was my first mechanical upgrade, he's the best anti-magic pet you can get (mechanical with a dragon attack--made the darkmoon tamer extremely easy). He also outspeeds a lot of pets that the zeppelin can't. But, there's a lot of mechanical pets that need stones: Pet Bombling, Personal World Destroyer, and Warbot/Lil Smokey (if you don't have a Mini-Thor) are also pretty good.